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| author | Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> | 2011-01-14 00:47:43 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-14 02:32:51 +0100 |
| commit | 50de1dd967d4ba3b8a90ebe7a4f5feca24191317 (patch) | |
| tree | ed2aa4352ae3c2887a90ef6279588a7048397d1b /mm/migrate.c | |
| parent | memcg: use [kv]zalloc[_node] rather than [kv]malloc+memset (diff) | |
| download | linux-50de1dd967d4ba3b8a90ebe7a4f5feca24191317.tar.xz linux-50de1dd967d4ba3b8a90ebe7a4f5feca24191317.zip | |
memcg: fix memory migration of shmem swapcache
In the current implementation mem_cgroup_end_migration() decides whether
the page migration has succeeded or not by checking "oldpage->mapping".
But if we are tring to migrate a shmem swapcache, the page->mapping of it
is NULL from the begining, so the check would be invalid. As a result,
mem_cgroup_end_migration() assumes the migration has succeeded even if
it's not, so "newpage" would be freed while it's not uncharged.
This patch fixes it by passing mem_cgroup_end_migration() the result of
the page migration.
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 5b7d1fd29621..46fe8cc13d67 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -768,7 +768,7 @@ skip_unmap: uncharge: if (!charge) - mem_cgroup_end_migration(mem, page, newpage); + mem_cgroup_end_migration(mem, page, newpage, rc == 0); unlock: unlock_page(page); |